diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1c467d48..7f682d0f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,7 +27,7 @@ if(ADDRESS_SANITIZER)
 endif()
 
 if(MSVC)
-  add_compile_options("/wd4838")
+  add_compile_options("/wd4838") # silence implicit narrowing conversion warnings
 endif()
 
 # whether we are using MSBuild as a generator